IEEE 421.2-2014 pdf free.IEEE Guide for Identification, Testing, and Evaluation of the Dynamic Performance of Excitation Control Systems.
automatic voltage regulator (AVR): This term refers to the controller that regulates the synchronous machine terminal voltage. More recent systems frequently include limiters, field current regulator and power system stabilizer with the AVR within the same electronic module. The term exci&#ion coniroller may be used to refer to such an electronic module to emphasize that the included control algorithms adjust machine excitation with a wider purpose than simple regulation of terminal voltage.
ceiling current: The maximum field current that the excitation system is designed to supply. Typically. this is related to the thermal capability of the excitation system equipment or the synchronous machine field circuit capability.
NOTE—There can be separate short-time and steady-state values.
ceiling voltage: The maximum direct voltage that the excitation system is designed to supply from its terminals under defined conditions.
dynamic response: The output voltage of a control system or intermediate point in a system expressed as a flinet ion of time,
excitation control system: The feedback control system that includes the synchronous machine and its excitation system. The term is used to distinguish the performance of the synchronous machine and excitation system in conjunction with the power system from that of the excitation system alone.
excitation limiter: A control function that provides an additional input to the voltage regulator to prevent a current, voltage, or other electrical quantity from exceeding preset limits. Typical excitation limiters include overvoltage (OV). volts.hertz (V/Hz), instantaneous and timed overexcitation limiter (OFL), undcrexcitation limiter (IJEL). and stator overcurrent limiters (SCL). Individual limiters arc described in IEEE Std 42l.ITM.
excitation system nominal response: A figure of merit for non-high initial response excitation systems related to the ability of the excitation system to respond to transient stability issues and to permit comparisons of excitation systems. The nominal response describes the rate of increase of the excitation system output voltage and is determined from the excitation system voltage response curve (see 5.6).
excitation system rated current: The direct current at the excitation system output terminals that the excitation system can supply under defined conditions of its operation. This current is at least that value required by the synchronous machine under the most demanding continuous operating conditions (generally resulting from synchronous machine voltage, frequency. and power factor variations).
excitation system rated voltage: The direct voltage at the excitation system output terminals that the excitation system provides when delivering excitation system rated current under rated continuous load conditions of the synchronous machine with its field winding at (1) 75 °C for field windings designed to operate at rating with a temperature rise of 60 °C or less; or (2) 100 °C for field windings designed to operate at rating with a temperature rise greater than 60 °C.IEEE 421.2 pdf free download.